Farmers across Northern Ireland are urged to be aware of the threat of bluetongue virus (BTV).

This follows a significant rise in cases in Britain and the confirmation of a number of recent cases in the Republic of Ireland.

Department of Agriculture, Environment and Rural Affairs Minister Andrew Muir said there is ongoing concerns over the threat to cattle, sheep, goats, deer, llamas and alpacas.

"Since the beginning of the current bluetongue season, which commenced on July 1, 2026, there have been more than 1,600 confirmed cases of the BTV-3 strain in Great Britain," Minister Muir said.

“Furthermore, the Irish Republic this season has confirmed eight cases of BTV-3 in counties Wexford, Wicklow, Kildare and Louth.

"The surge in cases in Britain, together with the recent detections in Ireland and the increased severity of clinical signs is concerning."

Cases to emerge

While no cases of bluetongue have been detected in Northern Ireland during this season, Minister Muir said it is possible the disease, which affects fertility and overall productivity on farms, could already be present in herds without animals exhibiting noticeable signs at this stage.

"As a result, I and my officials believe there is a strong possibility clinical cases will emerge over the next month," the minister said.

A number of suspect cases have been reported in recent weeks in Northern Ireland.

However, all have subsequently been ruled out following laboratory testing, DAERA said.

Nevertheless, Minister Muir urged farmers to remain vigilant and to report any concerns to DAERA vets who would investigate them.

Vaccination

The DAERA minister also encouraged farmers to consider vaccination of their livestock.

“Given the significant increase in cases in Great Britain and the recent confirmation of cases in Ireland, I would again urge farmers to discuss their business concerns with their private veterinary practitioner,” he said.  

"It takes approximately six weeks for cattle and three weeks for sheep to develop full immunity following vaccination.

"My officials continue to respond to all reported suspect cases as a priority. 

"Active surveillance is ongoing at abattoirs; alongside post-import testing of susceptible animals imported from mainland EU countries."

Anyone who suspects bluetongue in their animals should report it immediately to DAERA on 0300 200 7840 or their local DAERA Direct Regional Office and seek veterinary advice.

“In the meantime, my officials are maintaining close engagement with counterparts in Britain and the Irish Republic to monitor the evolving situation," Minister Muir added.

Clinical signs

While there are no risks to public health or food safety and meat and dairy products remain safe to eat, bluetongue can have devastating impacts on herds.

Clinical signs of the disease can include lesions, sores and ulcerations affecting the nose, eyes, mouth, gums and dental pads, as well as fever, breathing difficulties, loss of appetite, lethargy, abortion, stillbirths and birth deformities in offspring.